fix: add missing include to make build work again (lneely#77)

* fix: add  to make build work again

* fix: add  to make build work again

* fix: add  to make build work again

* fix: correct alphabetical order

Author: ahuemmer

CLI11.hpp

@@ -4,6 +4,7 @@ used by this program.
 */
 
 #pragma once
+#include <algorithm>
 #include <functional>
 #include <iostream>
 #include <map>
@@ -392,4 +393,4 @@ class App {
 namespace CLI {
 using App = ::App;
 using ParseError = ::ParseError;
-} // namespace CLI
+} // namespace CLI